/*
 * Copyright 2010 Pierre Heinzerling, Uwe Janner, Patrick Wright
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.upp.publinksky.operations.theme;

import com.upp.publinksky.dao.InvitationDAO;
import com.upp.publinksky.model.Invitation;
import com.upp.publinksky.model.Theme;
import com.upp.publinksky.operations.util.ThemeLookup;
import com.upp.publinksky.util.JsonConversion;
import com.upp.publinksky.util.PMF;
import com.upp.publinksky.util.UserUtil;

import javax.jdo.PersistenceManager;
import javax.jdo.Query;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.logging.Logger;


/**
 */
@Path("/theme/list/modified")
@SuppressWarnings({"unchecked"})
public class ThemeListModified {
    private static final Logger log = Logger.getLogger(ThemeListModified.class.getName());

    @GET
    @Produces(MediaType.APPLICATION_JSON)
    public Response listModified() {
        final String email = UserUtil.getCurrentUserEmail();
        PersistenceManager pm = PMF.get().getPersistenceManager();
        List<Theme> modified = new ArrayList<Theme>();

        try {
            // all created by this user
            Query qry = pm.newQuery(Theme.class);
            qry.setFilter("ownerEmail == email");
            qry.declareParameters("String email");
            Collection<? extends Theme> allThemes = (Collection<? extends Theme>) qry.execute(email);
            for (Theme theme : allThemes) {
                if (!theme.isScratchPad()
                        && theme.isOwner(email)
                        && !theme.wasLastUpdatedBy(email)
                        && !theme.hasOwnerRetrievedSinceLastModified()) {
                    modified.add(theme);
                }
            }

            // all where they were invited
            List<Invitation> invitations = new ArrayList<Invitation>();
            invitations.addAll(InvitationDAO.listAllInvitationsToUser(email, pm));
            for (Iterator<Invitation> iter = invitations.iterator(); iter.hasNext();) {
                Invitation invitation = iter.next();
                if (invitation.isDeclined()) {
                    iter.remove();
                }
            }
            for (Invitation inv : invitations) {
                Theme theme = ThemeLookup.checkedGetTheme(inv.getTheme().getId(), pm);
                if (    inv.isInvitee(email) 
                        && theme.getLastUpdateCounter() != inv.getLastRetrievedThemeCounter()
                        && !theme.wasLastUpdatedBy(email)) {
                    modified.add(theme);
                }
            }

            return Response.ok(JsonConversion.toJson(modified), MediaType.APPLICATION_JSON_TYPE).build();
        } finally {
            pm.close();
        }
    }
}